diff --git a/lib/authentication/Authenticator.inc b/lib/authentication/Authenticator.inc
index 6e58a0f..6863f4a 100644
--- a/lib/authentication/Authenticator.inc
+++ b/lib/authentication/Authenticator.inc
@@ -1,5 +1,5 @@
 <?php
-require_once("$default->fileSystemRoot/lib/users/User.inc");
+require_once(KT_LIB_DIR . '/users/User.inc');
 /**
  * $Id$
  *
diff --git a/lib/authentication/DBAuthenticator.inc b/lib/authentication/DBAuthenticator.inc
index 41789a5..2d2ed88 100644
--- a/lib/authentication/DBAuthenticator.inc
+++ b/lib/authentication/DBAuthenticator.inc
@@ -1,5 +1,5 @@
 <?php
-require_once("$default->fileSystemRoot/lib/authentication/Authenticator.inc");
+require_once(KT_LIB_DIR . "/authentication/Authenticator.inc");
 /**
  * $Id$
  *